Pneumatic tacker



O. A. WANDEL PNEUMATIC TACKER Filed Jan. 3, 1948 II/I/I/l/fl IIIIIIII June 26 1951 I N V EN TOR. 0668/ a Wanda; BY WM fl m Patented June 26, 1951 UNITED" PNEUMATIC TACKEBI (isms. twaiidi, Chicago lll. assignor to Henry A. Thrstenson, Chicago, Illa.

Application January 3, 1948,"'Serial-No '421" More particularly; the invention yisuconcerned with a fastener-drivingdevice of the type which comprises a forward chamber having, a vertical fastener guideway ttherein; a reciprocal driving plunger in the driveway, a bottom horizontally disposed fastener feeding chamber provided with means for delivering fasteners to driving position beneath the plunger and a mechanism foropcrating the plunger. A

It is an object ofutheainvention to' provide in a fastener drivinggdeviceof the type described a pneumatically actuated plunger operatin means.

A further object of the invention is to-provide a'fastener driving .rlevice of the type described in which theuplunger operating mechanism comprises a driving; spring and a pneumatically operating trip mechanism for compressing-the spring, and-then releasing it to operate the plunger. s t

Another object of the invention is to lprovicle a fastener driving device For the type described wherein a pneumatic unit' isu-provided whieh'can be readily substituted for the; conventional pivoted handle member for cooperation withthe trip mechanism to operate thedriving plunger.

These and other objects of the invention will beapparent from a consideration of the preferred form of the device which is shown by way of illustration in' the accompanying drawings; wherein: s V i Fig. 1 is a perspective view of a fastener driving device having incorporated therein a pneumatic unit which illustrates the principles ofYthe-im vention;

Fig. 2 is atside' el'evation of the device to an enlarged scale with portions thereof broken away; and t Fig. 3 is a section on the line 3-}3 of Fig. 2.

The present'invention is applicable to-various kinds of fastener driving devices suchasstapliiig machines, compression tackers, magazine hammers, etc. which include a plunger operating mechanism having a trip means.

For convenience in illustration the invention shown-embodied-in a tacker used for driving U-shaped staples.-

A handle-operated-tacker of this type shown and described in the copending applications of Kenneth D. Morberg, Serial No. 629,675, filed November 5, 1945 and issued as U. S. Letters Patent No. 2,548,736, on April 10, 1951; Serial No. 717,-

692, =fi1edtDecember21111946 ianda iSSLIBd I aSJ UL" S Letters Patent-1N0. 2,456,526; oncDecenrbeii 1948; and Oscar Aslwandeh serial:No; 178,953, filediOctober Qt-"19%;: and issued asUZsSi: Letters Patent; No.1; 2,556,992Lon June 12,15 19513:. to. which reference is made for detailed description of :those featuresrwhichlare notzdescribed intdetail in this application. 7 t s i v I The illustrated form: t of .theita'cker comprises a generally U -shaped -sframe; l0 zsnaving'a {onward chamber or driving head-:1 formedby spaced yerends of; iwhichhai'e"-sturned ririwardlg fix to zprov-ide flanges l 4 and .l 5 'defiiiing gpart's" oft theafront race of the tacker-andttheiforwardzside ofuthe' guide way "for: thesdriving, plunger 6 which ismo'untd for vertical reciprocation therein. 3 V tThe drivirigepldngenwl6eisislmountedxs ciproca-lzmovement oina fixed guideiposti l ll andris actuatedtby a. compressionrspringel 8.:-whioh;tsu1frounds the post'iafl: .with its Llowentend 'seated imra recess 4| 9 in :theupper end of: theeplunger: :l 6.1: l The spring in I 8 eextendszatoj-t cap": :20 atnthettop oi the guideways- Th'e, plunger J 6 carries: ca stapleudrivingrblad'ewz l atritherbottom end, of'pithe forward face thereofw Theldrivinggplung er [Bis-adapted to :be elevated and then released for the driving stroke by a trip a mechanism: 2 2' :withinthe'driving headlloa t g The :tacken; miprovide'dw iwithiaii staple supply magazine: whichds arranged; in .a horizontally ex; tending chamberxin (the. bottomlportion 2310f: the outer frame I I0 rand whichidelii erss stapleaaor fasteners to driving position 1 beneath hem-wing blade 2| at the forward-fender {the nic e the forward;portionof-theguideway forth fajs ners b ms r -b a's nei lli. l fid' mfit i member 12 4 whichis secured onthe frame 10 by thetransversfe1pin125; I v The trip mechanism His actuatedbra'pis d i rod 26 which is connected by the linki lfwitlfthe top ,end of the bell cranle member .2 8 which-forms at @1 th ea aaas nm --whi h i nir sd a out h e n ns e w r .--W 1 i9 removably, mounted in the spacednside-plates MI 2 and l3. is

The pistonrod zii is mounted iorhorizontalreciprocationinia generallytubulan casingew The rod-:26 :slidestrina bearing forming: plug-(assembles 3 l and :32nwhich' taresecured um the fonwa rdand rearward end of the casing 30. The plug assembly 3| is provided with a sleeve 33 for receiving the forward end of the piston rod 26. The plug assembly 32 is provided with a sleeve 34 tor re- 3 ceiving the reduced rearward end of the piston rod 26.

The rod 26 carries a piston assembly 35 which is urged in the forward direction by a compression spring 36. Compressed air is admitted to the chamber 31 formed between the plug assemblies 3| and 32 in the housing 30 through a passageway 38 extending downwardly into the handle 'or grip 'member 39 and connected by a valve 40 and passageway llv with a hose coupling 42 for receiving a compressed air supply line.

The valve 40 is reciprocably movable in a horizontal direction and is operated by a trigger 43 secured at the forward end of the handle forming portion 39. A pressure release vent or aperture 44 is provided for permitting the air toescape and allowing the piston 35 to be returned by the spring 36 when the valve 40 is closed. The handle forming portion 39 is secured between the upright frame members 45 and 46 of the frame Ill and is preferably formed of a material having indentations along thelower edge for accommodating the fingers of'the user.

The casing 30'has a forward portion 41 which extends approximately to the cap member 20 in protecting relation to the trip mechanism member 28 and'the connecting link 21. The casing 30 and the handle forming portion 39 are constructed so that the pneumatic mechanism and the trip mechanism 22 may be readily removed as a unit by removing the mounting pins 48 which secure the handle forming portion 39 between the frame members 45 and 46 and the pivot pin 29. The pins 48 and:29 on which the trip mechanism 22 is mounted may be removably secured in the side frame plates I2 and I3 in any conventional manner.

In using the tacker the trip mechanism is actuated by the piston rod 26 which is controlled by the trigger operated valve 40. The driving plunger I6 is.raised and released for the driving operation by operation of the trip mechanism 22. The pneumatic operating unit is readily substituted for the handle heretofore used in this type of tacker and thus provides alight, compact, easily attached unit for converting the tacker from hand operation to pneumatic opera- .tion. With the arrangement of cooperating trip mechanism and pneumatic actuator there is no kickback ,on the tacker'due to the pneumatic mechanism when the driving operation is performed. The pneumatic mechanism'merely releases the driving plunger for the driving operation through actuation of the compression spring -I8 and the trip mechanism 22. V v

7 While specific details of materials and construction havebeen referred to in describing the preferred form of the invention, it will be understood that other materials and other details of construction may be resorted to within the spirit of the invention.

I claim:

i 1. In a fastener driving mechanism having a housing, a spring actuated driver mounted in a guideway in the housing and fastener feeding means for delivering fasteners in driving position, the improvement comprising a trip mechanism for raising the driver against the action of the spring to a predetermined position and then releasing the same and a pneumatic means for actuating the trip mechanism comprising a reciprocable rod and a link connecting the end of said rod with said trip mechanism.

2. A fastener driving mechanism comprising a housing having a guideway, a driver mounted in said guideway, means for delivering fasteners to a driving position relative to the driver, a compression spring for actuating the driver, a trip mechanism for moving the driver against the action of the spring to a predetermined position and then releasing the same to drive a fastener, means for removably mounting said trip mechanism in said housing, a pneumatic unit having a reciprocable rod for actuating the trip mechanism, means for removably mounting said pneumatic unit on said housing, and an operating member pivotally connecting said trip mech anism and said reciprocable rod.

3. In a fastener driving mechanism having a frame, a guideway in a forward portion of the frame, a spring actuated driver mounted in the guideway and fastener feeding means for delivering fasteners in driving position beneath the driver, the improvement comprising a trip mechanism for raising the driver against the action of the spring to a predetermined position and then releasing the same, said trip mechanism including a pivotally mounted operating lever separably mounted on said frame, pneumatic means necting link between the end of said rod and said trip mechanism operating lever.

4. In a fastener driving mechanism having a frame member of upwardly opening U-shaped form, characterized by a chamber forming head portion and laterally spaced handle grip portions extending rearwardly of said head portion, a spring actuated driver mounted in a guideway in said chamber, fastener feeding means for delivering fasteners in driving position beneath said driver, a trip mechanism in said chamber for raising the driver against the action of the spring to a predetermined position and then' releasing the same, said trip mechanism comprising a bell crank member swingably mounted on a removable pin, pneumatic means for actuating said trip mechanism, means for detachably mounting said pneumatic means between said handle grip portions, said pneumatic means having a reciprocable rod extending toward said trip mechanism, and a member pivotally connected with said bell crank and said reciprocable rod whereby upon reciprocal movement of said rod said bell crank is swung about its pivotal mountmg. i

' OSCAR A. WANDEL.

REFERENCES CITED The following references are ofrecord in the fi1e of this patent:

' UNITED STATES PATENTS Number Name Date 7 1,672,384 Jensen June 5, 1928 1,934,979 Hopkins --j-,--- Nov. 14, 1933 1,943,661 Ellacott Jan. 16, 193d 2,361,483 Lang Oct. 31,1944 

